public void AddThreeBugsToRepoAndCheckWhetherAllReturnsTheCorrectBugs() { //arrange var context = new BugLoggerDbContext(); var repo = new BugsRepository(context); var countInDbBeforeAddingThreeBugs = context.Bugs.Count(); var bug1 = new Bug { Content = "test bug 1" }; var bug2 = new Bug { Content = "test bug 2" }; var bug3 = new Bug { Content = "test bug 3" }; //act context.Bugs.Add(bug1); context.Bugs.Add(bug2); context.Bugs.Add(bug3); context.SaveChanges(); //assert var countInDbAfterAddingThreeBugs = repo.All().ToList().Count; Assert.AreEqual(3, countInDbAfterAddingThreeBugs - countInDbBeforeAddingThreeBugs); }